SoftDevice interrupts and __WFI();

[[email protected]]

Hello! Is it possible to select to which interrupt types WFI (wake up from sleep mode) reacts?

I have a system with nRF51 where RTC clock initiates temperature measurements and I send them later over Bluetooth serial. My goal is to turn Bluetooth ON and put MCU to sleep. When temp gets measured, rtc interrupt will wake up the processor and data will be sent. Unfortunately the processor is being constantly woken up by SoftDevice interrupts, which generates more power usage. I know that I can't disable Softdevice and its interrupts, but is there a way to make WFI ignore them instead of doing unnecessary querries?

My pseudo code:

void RTC1_IRQHandler() {
	measure_temperature();
}

BLE_setup();
RTC1_setup();

void loop() {
  
  __WFI();    
  __SEV();    
  __WFI();    

  if(measurement_ready)
	send_over_ble();
}

[Jared]

Hi,

1. Just disable the Softdevice by calling sd_softdevice_disable().
2. The correct function to use when the Softdevice is enabled is sd_app_evt_wait(). If Softdevice is not enabled the correct sequence is, 
           // Wait for an event.

           __WFE();

   
   

           // Clear the event register.

           __SEV();

           __WFE();

[[email protected]]

1. Disabling the Softdevice will break an existing connection with the smartphone, right? I would like to avoid this.

2. This function will hold Softdevice events from interrupting the sleep mode, but the connection with the phone won't be affected?

[Jared]

[email protected] said:

1. Disabling the Softdevice will break an existing connection with the smartphone, right? I would like to avoid this.

 So will this:

but is there a way to make WFI ignore them instead of doing unnecessary querries?

 

[email protected] said:

2. This function will hold Softdevice events from interrupting the sleep mode, but the connection with the phone won't be affected?

 It will go into low power mode until a Softdevice interrupt is generated.